# STC SR00266SE - Type: Supplemental type certificate - Status: Current, Amended - Holder: Overseas Aircraft Support Inc., United States - Description: Replacement of the Lycoming Model T53-L-13B engine with a Lycoming Model T53-L-703 engine flat rated to the same power settings specified in Type Certificate Data Sheet (TCDS) H15NM - Applied: April 18, 1995 - Status date: June 26, 2025 - Product: Aircraft, Rotorcraft - Certification basis: Part 21, Part 27 - Data sheets: [TCDS H15NM](https://openairdocs.org/tcds/H15NM), [TCDS H7SO](https://openairdocs.org/tcds/H7SO), [TCDS R00004RC](https://openairdocs.org/tcds/R00004RC) - Certificate PDF: https://openairdocs.org/files/sha256/28/f0/28f0790edfeafd70036864f649bc3e6840d2eea16231836ad877b623996472ac - Approved model list and other attachments: [SR00266SE_AML.pdf](https://openairdocs.org/files/sha256/21/90/2190738f5b30cbf6fe89f2e68832082892139c61622e777891cab37ff143f2a0) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID183180490420250813183224.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SR00266SE ## ADs that name it (0) None. ## Approved models (3) - Hagglund Helicopters LLC UH-1H ([TCDS H15NM](https://openairdocs.org/tcds/H15NM)) - JJASPP Engineering Services LLC UH-1H ([TCDS R00004RC](https://openairdocs.org/tcds/R00004RC)) - Overseas Aircraft Support Inc. UH-1H ([TCDS H7SO](https://openairdocs.org/tcds/H7SO)) ## What the certificate says Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record. FAA 8110-2 (10/24) Page 1 of ___ * See attached FAA Approved Model List (AML) Number SR00266SE for approved rotorcraft models and applicable airworthiness regulations SR00266SE Overseas Aircraft Support, Inc. 3150 E. Airport Loop Road, Show Low, AZ 85901 * * * * Approval of this change in type design applies to basic Bell Model UH-1H rotorcraft as defined on Restricted Category Type Certificate No. H15NM, H7SO, R00004RC equipped with a Bel1 212 tail boom modification installed in accordance with Helipro Corporation International Supplemental Type Certificate (STC) No. SR00267SE. This approval should not be extended to aircraft of this model on which other previously approved modifications are incorporated unless it is determined by the installer that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that rotorcraft. 04/18/1995 10/18/2007 03/27/2013 05/18/2016 01/01/1996 10/18/2017 06/26/2025 ✔ 3 Replacement of the Lycoming Model T53-L-13B engine with a Lycoming Model T53-L-703 engine flat rated to the same power settings specified in Type Certificate Data Sheets (TCDS) H15NM, H7SO, & R00004RC in accordance with an FAA approved copy of McClenahan Installation Instructions No. DM9509-3, Revision "D", dated November 20, 1995. or later FAA approved revision. SR00266SE 3 SR00266SE Date Reissued: 02/23/2018; 04/20/2021; 03/03/2022; 08/01/2025 Date Amended: Rotorcraft equipped with this engine modification must be operated in accordance with Idaho Helicopter, Inc. Rotorcraft Flight Manual Supplement No. IHI-95-2, dated July 29, 1997, or later FAA-approved revision. The modified rotorcraft must be maintained in accordance with Idaho Helicopters, Inc. Maintenance Manual List No. UH-1H/T53-L-703, dated November 20, 1995, or later FAA-approved revisions. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission. End 3 3 Add Page ### SR00266SE_AML.pdf FEDERAL AVIATION ADMINISTRATION (FAA) APPROVED MODEL LIST (AML) SR00266SE FOR INSTALLATION OF LYCOMING MODEL T53-L-703 ENGINE ISSUE DATE: June 26, 2025 Page 1 of 2 **ITEM AIRCRAFT /** **ROTORCRAFT MAKE** **AIRCRAFT /** **ROTORCRAFT MODEL** **ORIGINAL TC NUMBER** **CERTIFICATION** **BASIS FOR** **ALTERATION** **FAA APPROVED** **AIRCRAFT /** **ROTORCRAFT FLIGHT** **MANUAL SUPPLEMENT** **FAA APPROVED** **MASTER DRAWING LIST** AML REV DATE Number Revision* Drawing Revision* 1. Hagglund Helicopters, LLC UH-1H Modified by STC SR00267SE H15NM 14 CFR Part 21.25(a)(1), CAR 7 Aug 1, 1956, including Admt 7-1 thru 7-4 IHI-95-2 IR DM.9509-3 D 2. Overseas Aircraft Support Inc. UH-1H Modified by STC SR00267SE H7SO 14 CFR Part 21.25(a)(1), 14 CFR 29, Admt 1, effective August 12, 1965 and 14 CFR 29.1529, Admt 20, effective September 11, 1980 **IHI-95-2 IR DM 9509-3 D** 3. JJASP Engineering Services UH-1H Modified by STC SR00267SE R00004RC 14 CFR Part 21.25(a)(1), 14 CFR 29, Admt 1, effective August 12, 1965 and 14 CFR 29.1529, Admt 20, effective September 11, 1980 **IHI-95-2 IR DM9509-3 D** * Or later FAA Approved Revision FEDERAL AVIATION ADMINISTRATION (FAA) APPROVED MODEL LIST (AML) SR00266SE FOR INSTALLATION OF LYCOMING MODEL T53-L-703 ENGINE ISSUE DATE: June 26, 2025 Page 2 of 2 FAA Approved: FOR: Manager, West Certification Branch AMENDED: REISSUED: ## Every issue (6) - June 26, 2025: Amended, Current. [certificate](https://openairdocs.org/files/sha256/28/f0/28f0790edfeafd70036864f649bc3e6840d2eea16231836ad877b623996472ac), [SR00266SE_AML.pdf](https://openairdocs.org/files/sha256/21/90/2190738f5b30cbf6fe89f2e68832082892139c61622e777891cab37ff143f2a0) - March 3, 2022: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/11/c0/11c0e0788fc782765a646c44c76a8cbff9a68dcadbe2eaabece54051f9e76c49) - February 23, 2018: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/2b/10/2b101f3bd5bcf7b9b478d542c6132502f9c08028abf9cf6fb049c63f6995099c) - May 18, 2016: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/fe/41/fe41304d116a128332323305e9ae1d6990a976ff19c354cd57ca347b6241df71) - March 27, 2013: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/5a/d6/5ad64b82fc74618015697758e4b69571e957e41060cd70fe90941b3bf1a05b55) - October 18, 2007: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/c1/b6/c1b62713d61687edbfa8a0fd448efdad203eb5fac848087877e7b7ac4e442ab0) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.